1980～2011年南宁市大气稳定度和混合层厚度特征

摘要

利用南宁市1980 ～ 2011年逐日4个时次的气象资料,运用修正的Pasquill稳定度分类方法和国家标准GB/T13201-91规定的混合层厚度计算方法,计算逐日4个时次的稳定度等级和混合层厚度,分析各类稳定度频率和混合层厚度的逐年、逐月和不同时次的变化规律.结果表明,南宁市大气稳定度以中性、稳定类、较稳定类为主,而不稳定类中以B类居多,且不稳定类主要出现在汛期和午后；南宁市大气混合层厚度春夏高,秋冬低.%On the basis of the daily observation in Nanning at02:00, 08:00, 14:00, 20:00 from 1980 to 2011, the atmospheric stabilitiesrnand thickness of atmospheric mixed layer of 4 times were calculated by using the method of correctional Pasquill and the national standard GB/rnT 13201-91. And their distribution characteristics were analyzed month by month and year by year according to 4 daily intervals. The resultsrnshowed that neutral and stable categories are the bulk of the atmospheric stabilities from 1980 to 2011 in Naning. The B category preponderatesrnin the unstable categories, and the unstable categories mainly appear in the flood season and the afternoon. The thickness of atmospheric mixedrnlayer in Nanning is higher in spring and summer and lower in autumn and winter.